HOUSTON — Arson investigators as of Monday had not determined the cause of a fire over the weekend at the Toyota Center.

The Houston Fire Department was alerted to a fire around 8:30 a.m. Sunday in the lower level of the building under the concourse level.

When units arrived, the fire was out due to the sprinkler system. The fire was contained to a small area of the facility.

The sprinkler system was put back in service and the building is safe to use, according to officials.

Officials said there is no structural damage.